"Now we have to decided in which weight division this fight is going to happen, if Pettis is coming down, like he once said he would do (for UFC 163), but didn’t due to an injury, if Aldo will move up, or if it’s going to be (a catchweight) at 150 pounds," Aldo’s manager Andre Pederneiras said.

"(A catchweight) would be interesting for both, they would keep the belts and do the fight everybody wants to see. Nobody wants to take the other’s title, we want to see the fight and do a great show for everybody. Aldo would move up a little, Pettis cuts a little, and it’s good for everybody."

Pederneiras thinks Aldo has the advantage over Pettis when it comes to standup, and also if the action happens to hit the mat.

"It’s going to be a tough fight, like all the others," Pederneiras said. "I always say that the next fight is always the toughest. It’s going to be just like another fight. I think that Aldo has all the weapons to beat Pettis. I don’t see many advantages for Pettis in this match-up."

UFC President Dana White said at the UFC 169 post-fight press conference that he likes the idea of Pettis vs Aldo at 155 pounds, not at a catchweight

“I’ve been talking about that fight. I like that fight. I like Jose at 155,” White said. “I think the weight cut’s much easier for him. But again, I’ll throw it back at him. At the end of the day, if he wants, he’s the king at 145. If he wants to move to 155, I think it’s a huge fight with Pettis. It doesn’t suck.”

White says Aldo will likely vacate the UFC's 145-pound title to move up for a fight against Pettis.

If he should lose to Pettis, he could then move back down to challenge for the 145-pound belt.

“He’ll vacate the title, move up to 155, and fight for the title,” White said of Aldo. “If he doesn’t win the title at 155, he can go back and challenge for the 145-pound title if he wanted to do that, or if he wins the 155-pound title and two other guys would fight for the 145-pound title.”

Pettis, who is sidelined due to injury until at least the end of the summer, is on a four-fight win streak. Aldo, 27, hasn't lost since 2005.

The date and venue for Pettis vs Aldo hasn't yet been announced, and it hasn't yet been confirmed if the fight will happen at 145, 150 or 155 pounds.